how to send verification email in php code example

Example: email verification in php

$email_a = '[email protected]';
$email_b = 'bogus';

if (filter_var($email_a, FILTER_VALIDATE_EMAIL)) {
  	//OK
    echo "L'adresse email '$email_a' est considérée comme valide."; 
}
if (filter_var($email_b, FILTER_VALIDATE_EMAIL)) {
  	//OK
    echo "L'adresse email '$email_b' est considérée comme valide.";
} 
else {
  	// NOT OK
    echo "L'adresse email '$email_b' est considérée comme invalide.";
}
?>